SUCCESSIONAL PATTERN AND PROCESS IN SECONDARY FORESTS OF DIFFERENT AGES IN THE EASTERN AMAZON
DOI:
https://doi.org/10.5902/198050981872Keywords:
Amazon, chronosequence, forestry succession, secondary forest.Abstract
Most published studies of secondary forest succession in the Amazon examine stands of different ages that represent a successional chronosequence, rather than monitoring a single stand over the long-term. This study compares floristic composition and structure of tree species with diameter at 1.3 m height (DBH) ≥ 1 cm in a 4-year-old and a 12-year-old re-growth stand in the Eastern Amazon, and examines mortality and recruitment occurring within both stands based on repeated sampling carried out annually for four years. The study areas were abandoned after multiple agricultural cicles that lasted 7 to 10 years, beginning in ~1940. Both stands are largely dominated by the same tree species Lacistema pubescens and Vismia guianensis, with significantly higher stem density, diameter, height, basal area and species richness in the 12-year-old stand. In the 4-year-old stand there were measured an increase in annual net recruitment during the first two data collection periods but relatively lower net recruitment during the last evaluation period, indicating on-going but gradually weakening colonization. There were registered a high net mortality during the first two data collection periods in the 12-years-old stand with a relatively lower net mortality during the last evaluation indicating rapid self thinning. When used in combination, the chronosequence and the longitudinal approaches significantly strengthen the understanding of successional development.
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